INFO: task syz-executor.1:27142 blocked for more than 143 seconds. Not tainted 6.5.0-rc4-syzkaller-00227-g024ff300db33 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:23616 pid:27142 ppid:23496 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5381 [inline] __schedule+0xee1/0x59f0 kernel/sched/core.c:6710 schedule+0xe7/0x1b0 kernel/sched/core.c:6786 wb_wait_for_completion+0x1ae/0x270 fs/fs-writeback.c:192 __writeback_inodes_sb_nr+0x1d8/0x270 fs/fs-writeback.c:2650 try_to_writeback_inodes_sb+0x97/0xc0 fs/fs-writeback.c:2698 ext4_nonda_switch+0x1a9/0x1f0 fs/ext4/inode.c:2838 ext4_da_write_begin+0x16e/0x8c0 fs/ext4/inode.c:2865 generic_perform_write+0x278/0x600 mm/filemap.c:3923 ext4_buffered_write_iter+0x11f/0x3c0 fs/ext4/file.c:299 ext4_file_write_iter+0x7ee/0x1950 fs/ext4/file.c:722 __kernel_write_iter+0x261/0x7e0 fs/read_write.c:517 dump_emit_page fs/coredump.c:888 [inline] dump_user_range+0x299/0x790 fs/coredump.c:915 elf_core_dump+0x2721/0x38e0 fs/binfmt_elf.c:2142 do_coredump+0x2c96/0x3fc0 fs/coredump.c:764 get_signal+0x2464/0x2770 kernel/signal.c:2867 arch_do_signal_or_restart+0x89/0x5f0 arch/x86/kernel/signal.c:308 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204 irqentry_exit_to_user_mode+0x9/0x40 kernel/entry/common.c:310 asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:564 RIP: 0033:0x7f1b85c7caf1 RSP: 002b:0000000020000050 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007f1b85d9bf80 RCX: 00007f1b85c7cae9 RDX: 0000000020000080 RSI: 0000000020000050 RDI: 0000000000000000 RBP: 00007f1b85cc847a R08: 0000000020000100 R09: 0000000020000100 R10: 00000000200000c0 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f1b85d9bf80 R15: 00007ffdb63cb488 INFO: task syz-executor.1:27225 blocked for more than 143 seconds. Not tainted 6.5.0-rc4-syzkaller-00227-g024ff300db33 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:23552 pid:27225 ppid:23496 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5381 [inline] __schedule+0xee1/0x59f0 kernel/sched/core.c:6710 schedule+0xe7/0x1b0 kernel/sched/core.c:6786 wb_wait_for_completion+0x1ae/0x270 fs/fs-writeback.c:192 __writeback_inodes_sb_nr+0x1d8/0x270 fs/fs-writeback.c:2650 try_to_writeback_inodes_sb+0x97/0xc0 fs/fs-writeback.c:2698 ext4_nonda_switch+0x1a9/0x1f0 fs/ext4/inode.c:2838 ext4_da_write_begin+0x16e/0x8c0 fs/ext4/inode.c:2865 generic_perform_write+0x278/0x600 mm/filemap.c:3923 ext4_buffered_write_iter+0x11f/0x3c0 fs/ext4/file.c:299 ext4_file_write_iter+0x7ee/0x1950 fs/ext4/file.c:722 __kernel_write_iter+0x261/0x7e0 fs/read_write.c:517 dump_emit_page fs/coredump.c:888 [inline] dump_user_range+0x299/0x790 fs/coredump.c:915 elf_core_dump+0x2721/0x38e0 fs/binfmt_elf.c:2142 do_coredump+0x2c96/0x3fc0 fs/coredump.c:764 get_signal+0x2464/0x2770 kernel/signal.c:2867 arch_do_signal_or_restart+0x89/0x5f0 arch/x86/kernel/signal.c:308 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204 irqentry_exit_to_user_mode+0x9/0x40 kernel/entry/common.c:310 asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:564 RIP: 0033:0x7f1b85c7caf1 RSP: 002b:0000000020000050 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007f1b85d9bf80 RCX: 00007f1b85c7cae9 RDX: 0000000020000080 RSI: 0000000020000050 RDI: 0000000000000000 RBP: 00007f1b85cc847a R08: 0000000020000100 R09: 0000000020000100 R10: 00000000200000c0 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f1b85d9bf80 R15: 00007ffdb63cb488 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/13: #0: ffffffff8c9a5970 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x2c/0xe20 kernel/rcu/tasks.h:522 1 lock held by rcu_tasks_trace/14: #0: ffffffff8c9a5670 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x2c/0xe20 kernel/rcu/tasks.h:522 1 lock held by khungtaskd/27: #0: ffffffff8c9a6580 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x340 kernel/locking/lockdep.c:6615 2 locks held by getty/4772: #0: ffff888028af4098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc900015b02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfcb/0x1480 drivers/tty/n_tty.c:2187 3 locks held by kworker/u4:18/11847: #0: ffff8880132e8938 ((wq_completion)writeback){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:20 [inline] #0: ffff8880132e8938 ((wq_completion)writeback){+.+.}-{0:0}, at: raw_atomic64_set include/linux/atomic/atomic-arch-fallback.h:2608 [inline] #0: ffff8880132e8938 ((wq_completion)writeback){+.+.}-{0:0}, at: raw_atomic_long_set include/linux/atomic/atomic-long.h:79 [inline] #0: ffff8880132e8938 ((wq_completion)writeback){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:3196 [inline] #0: ffff8880132e8938 ((wq_completion)writeback){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:675 [inline] #0: ffff8880132e8938 ((wq_completion)writeback){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:702 [inline] #0: ffff8880132e8938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x96a/0x16f0 kernel/workqueue.c:2567 #1: ffffc90004f27d80 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x99e/0x16f0 kernel/workqueue.c:2571 #2: ffff88814bc9ebd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1b4/0x690 mm/page-writeback.c:2553 3 locks held by syz-executor.1/27142: #0: ffff88814bc9c410 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x2464/0x2770 kernel/signal.c:2867 #1: ffff888049722c00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:771 [inline] #1: ffff888049722c00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x3c0 fs/ext4/file.c:294 #2: ffff88814bc9c0e0 (&type->s_umount_key#31){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x21/0xc0 fs/fs-writeback.c:2695 3 locks held by syz-executor.1/27225: #0: ffff88814bc9c410 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x2464/0x2770 kernel/signal.c:2867 #1: ffff888087148e00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:771 [inline] #1: ffff888087148e00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x3c0 fs/ext4/file.c:294 #2: ffff88814bc9c0e0 (&type->s_umount_key#31){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x21/0xc0 fs/fs-writeback.c:2695 1 lock held by syz-executor.5/2171: #0: ffff88814bc9ebd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1b4/0x690 mm/page-writeback.c:2553 1 lock held by syz-executor.5/2191: #0: ffff88814bc9ebd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1b4/0x690 mm/page-writeback.c:2553 1 lock held by syz-executor.4/2241: #0: ffff88814bc9ebd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1b4/0x690 mm/page-writeback.c:2553 1 lock held by syz-executor.3/2244: #0: ffff88814bc9ebd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1b4/0x690 mm/page-writeback.c:2553 1 lock held by syz-executor.4/2257: #0: ffff88814bc9ebd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1b4/0x690 mm/page-writeback.c:2553 1 lock held by syz-executor.5/2260: #0: ffff88814bc9ebd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1b4/0x690 mm/page-writeback.c:2553 1 lock held by syz-executor.3/2265: #0: ffff88814bc9ebd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1b4/0x690 mm/page-writeback.c:2553 1 lock held by syz-executor.0/2268: #0: ffff88814bc9ebd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1b4/0x690 mm/page-writeback.c:2553 1 lock held by syz-executor.0/2288: #0: ffff88814bc9ebd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1b4/0x690 mm/page-writeback.c:2553 1 lock held by syz-executor.3/2308: #0: ffff88814bc9ebd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1b4/0x690 mm/page-writeback.c:2553 1 lock held by syz-executor.4/2330: #0: ffff88814bc9ebd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1b4/0x690 mm/page-writeback.c:2553 1 lock held by syz-executor.5/2346: #0: ffff88814bc9ebd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1b4/0x690 mm/page-writeback.c:2553 1 lock held by syz-executor.4/2494: #0: ffff88814bc9ebd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1b4/0x690 mm/page-writeback.c:2553 1 lock held by syz-executor.1/2556: #0: ffff88814bc9ebd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1b4/0x690 mm/page-writeback.c:2553 2 locks held by syz-executor.0/2633: #0: ffff88814bc9ebd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1b4/0x690 mm/page-writeback.c:2553 #1: ffff88814bd20988 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x10e7/0x1600 fs/jbd2/transaction.c:461 1 lock held by syz-executor.3/2641: #0: ffff88814bc9ebd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1b4/0x690 mm/page-writeback.c:2553 1 lock held by syz-executor.5/2695: #0: ffff88814bc9ebd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1b4/0x690 mm/page-writeback.c:2553 1 lock held by syz-executor.0/2696: #0: ffff88814bc9ebd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1b4/0x690 mm/page-writeback.c:2553 1 lock held by syz-executor.2/2700: #0: ffff88814bc9ebd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1b4/0x690 mm/page-writeback.c:2553 2 locks held by syz-executor.2/2709: #0: ffff88814bc9ebd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1b4/0x690 mm/page-writeback.c:2553 #1: ffff88814bd20988 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x10e7/0x1600 fs/jbd2/transaction.c:461 1 lock held by syz-executor.0/2710: #0: ffff88814bc9ebd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1b4/0x690 mm/page-writeback.c:2553 1 lock held by syz-executor.3/2722: #0: ffff88814bc9ebd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1b4/0x690 mm/page-writeback.c:2553 1 lock held by syz-executor.2/2727: #0: ffff88814bc9ebd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1b4/0x690 mm/page-writeback.c:2553 1 lock held by syz-executor.0/2728: #0: ffff88814bc9ebd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1b4/0x690 mm/page-writeback.c:2553 1 lock held by syz-executor.3/2731: #0: ffff88814bc9ebd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1b4/0x690 mm/page-writeback.c:2553 1 lock held by syz-executor.2/2734: #0: ffff88814bc9ebd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1b4/0x690 mm/page-writeback.c:2553 1 lock held by syz-executor.5/2847: #0: ffff88814bc9ebd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1b4/0x690 mm/page-writeback.c:2553 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 27 Comm: khungtaskd Not tainted 6.5.0-rc4-syzkaller-00227-g024ff300db33 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x277/0x380 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x2ac/0x310 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline] watchdog+0xf29/0x11b0 kernel/hung_task.c:379 kthread+0x33a/0x430 kernel/kthread.c:389 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 46 Comm: kworker/u4:3 Not tainted 6.5.0-rc4-syzkaller-00227-g024ff300db33 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 Workqueue: bat_events batadv_nc_worker RIP: 0010:lock_release+0x3c3/0x680 kernel/locking/lockdep.c:5769 Code: 58 f6 c4 02 0f 85 c8 01 00 00 48 f7 04 24 00 02 00 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df 48 01 c5 48 c7 45 00 00 00 00 00 45 08 00 00 00 00 48 8b 84 24 88 00 00 00 65 48 2b 04 25 28 00 RSP: 0018:ffffc90000b77af0 EFLAGS: 00000286 RAX: dffffc0000000000 RBX: 2ce4822c53ec0be5 RCX: ffffc90000b77b40 RDX: 1ffff11002b5d50f RSI: ffffffff8a6c7780 RDI: ffffffff8ac80560 RBP: fffff5200016ef60 R08: 0000000000000000 R09: fffffbfff1d571a2 R10: ffffffff8eab8d17 R11: 0000000000000000 R12: 0000000000000002 R13: 0000000000000003 R14: ffff888015aea880 R15: ffff888015ae9dc0 FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000558033773fb0 CR3: 000000000c776000 CR4: 0000000000350ee0 Call Trace: rcu_lock_release include/linux/rcupdate.h:308 [inline] rcu_read_unlock include/linux/rcupdate.h:782 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:412 [inline] batadv_nc_worker+0x8ff/0x10f0 net/batman-adv/network-coding.c:719 process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2597 worker_thread+0x687/0x1110 kernel/workqueue.c:2748 kthread+0x33a/0x430 kernel/kthread.c:389 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304